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Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The Wyoming doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The WY CDL doubles triples test covers the following sections of the Wyoming CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this WY CDL practice test now to prepare for the actual test!
1. Another name for front-end header boards is:
head belt.
cargo stopper.
containerized racks.
headache racks.
2. The weight of a truck:
does not influence stopping distance.
is not as important as the vehicle's center of gravity in determining stopping distance.
has no impact on stopping distance.
None of the above.
3. When coupling a double or triple, ________ should be attached last.
the trailer right behind the cab.
the more heavily loaded trailer.
the middle trailer.
None of the above.
4. Longer combination vehicles have the tendency to swing wide on turns. This is called:
5. The center of gravity of a trailer should be:
as high as possible.
at the front of the trailer.
at the rear of the trailer.
as low as possible.
6. You must have at least _____ inch tread depth in every major groove on front tires.
7. How does ABS help you?
ABS helps you avoid wheel lock up and maintain control when you brake hard on slippery surfaces.
ABS replaces your normal brakes and helps you  to stop faster.
ABS always shortens your stopping distance.
ABS makes stab braking more effective.
8. On any upgrade, gravity:
slows you down.
doesn't affect your speed.
doubles your speed.
speed you up.
9. As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:
a mechanical vibration.
air escaping from the open valve.
a thumping sound.
the service line valve close.
10. When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
You may not notice a major leak in the service line until you try to put the brakes on.
if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
The air could leak out of the trailer air tank, releasing its emergency brakes.
None of the above.
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WY CDL Doubles Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
Number of questions: 20
Correct answers to pass:16
Passing score:80%
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